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Consider the system represented by the equation given below. What would be the total phase value at ω = 0? 200/[s3 (s + 3) (s + 6) (s + 10)].

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Consider the system represented by the equation given below. What would be the total phase value at ω = 0?

200/[s3 (s + 3) (s + 6) (s + 10)].

(a) -90°

(b) -180°

(c) -270°

(d) -360°

The question was asked in class test.

The above asked question is from Nyquist Stability Criterion in chapter Stability in Frequency Domain of Control Systems

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Right option is (c) -270°

To elaborate: The phase can be calculated by the basic formula for calculating phase angle.

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